Sulfur-Free prototyping modeling material, designed to replace Kleen Klay and Roma Plastalina. For model making, sculpting, mold construction and work requiring non hardening clay. Unlike the materials it replaces Protolina contains NO SULFUR or SULFATES making it ideal for use with silicone type mold compound.

Protolina is available in three (3) different firmness and in two (2) colors